Why hasn't anybody ever looked into using an air-injected motor? *The principle is very simple. *Inject the fuel every stroke and also inject the air (under pressure) *The exhaust gasses are forced out when the fresh air is injected. *This way you can have a closed crankcase and eliminate burning the oil while every stroke is a power stroke. * The only new parts would be the compressor and air-injection system. *I would think emissions would be lower too.

Sound a lot like turbocharging to me...which is already available.

Turbocharging pressurizes the air entering the cylinders, but the way the motor runs is the same. (either a 2 stroke which burns the oil or a 4 stroke which only produces power every-other stroke) *If you inject the air, you don't have to burn the oil and you can have every stroke be a power stroke.

2- strokes don't have valves to regulate the flow. *On a 4 stroke the exaust valve closes while the fuel charge enters trapping the entire charge. *On a 2-stroke, part of the charge flows right out the open exaust port. *That is the reason 2-strokes will never compete with 4 as far as efficiency.

Give us more info on this air-injected motor, portage. *Sounds interesting. *Are there any real working examples out there? *Or is it something new? *Let us know what the deal is....

I read about it a while back in some magazine. *I can't recall which one. *Maybe Popular Mechanics or something. *Apparently it was invented quite a while ago and Ford bought the rights to the design. *I have never heard any more about it. *It seems like it would be a good fit for snowmobiles. *I thought somebody else might have more information. *As far as the effieciency goes, It may not be as effiecient as a 4 stroke, but would be far better than a conventional 2 stroke with less parts and easier rebuilds.